| extreme(noun, force, power, passion, strength) |
| extremity(noun, force, power, passion, strength) |
| facility(passion, vigor, wit, persuasiveness, articulateness) |
| fanaticism(noun, force, power, passion, strength) |
| ferment(noun, force, power, passion, strength) |
| ferocity(noun, force, power, passion, strength) |
| fervency(noun, force, power, passion, strength) |
| fervor(noun, force, power, passion, strength) |
| fire(noun, activity, go, force, style) |
| flow(passion, vigor, wit, persuasiveness, articulateness) |
| flower power |
| force majeure |
| forcibleness(control, force, power, strength, ability) |
| forte |
| fortitude(noun, activity, go, drive, power) |
| full blast |
| fury(noun, force, power, passion, strength) |
| getup |
| go(noun, activity, style, drive, power) |
| go ahead |